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April 10, 2026

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April 10, 2026

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"This spectacular species is the most famous of all pitcher plants. Known to catch rats, frogs and lizards as well as insects, the huge pitchers of N. rajah are unmistakable. This species was named in honour of Sir James Brooke, one of the White Rajahs of Sarawak's past. It grows only on Mount Kinabalu and Mount Tambuyukon in Sabah, though it is not rare in this area. Legend has it that this species grows only in the spray zones around waterfalls, on ultramafic soils. Although it is true that it grows on ultramafic soils, it is certainly not found in the spray zones of waterfalls, but grows in open, grassy areas within its altitudinal distribution. Generally these areas are land slips or flat ridge tops, where the soil is loose. Although rainfall may be very high in these places, excess water seems to drain away quickly, and the plants are most common at seepages which are less prone to drying out. The stems of N. rajah tend to be decumbent rather than climbing. The leaves are distinctive, as the tendril is inserted about 2 cm from the apex. Although this characteristic is more pronounced in N. rajah and N. clipeata than in other species, it is not necessarily exclusive, as mature plants of many species have slightly peltate leaves. The lower pitchers are tub-shaped and do not sit upright, but lean back against other objects. Up to one litre of fluid may be contained in a pitcher. The peristome is wide and distinctly scalloped. The lid is vaulted and very large relative to the rest of the pitcher. The exterior parts of the pitcher are scarlet to purple, while the inside is yellow to purple. All other parts are yellow-green. Upper and intermediate pitchers are rarely produced, but are smaller, less brightly coloured, and more funnel-shaped than the lower pitchers. The flowers are usually brownish-yellow in colour and, like those of many Nepenthes, have a strong sugary smell. This species seems to flower at any time of the year and hybrids between it and all other Nepenthes species on Mount Kinabalu, except N. lowii, have been recorded. There is no noticeable variation within N. rajah, and no forms or varieties have been described."

- Nepenthes rajah

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"The most famous of all pitcher plants is the giant N. rajah, found only on Mount Kinabalu and neighbouring Mount Tambuyukon in Sabah. The pitchers are unmistakable in appearance, being large (≀35 cm high) and ovoid in shape with a huge, vaulted lid. The peristome is expanded and scalloped at the outer edge, while the inner margin is lined with short, sharp teeth. The pitchers rest on the ground and are often reclined, leaning against surrounding objects for support. The tendril joins the leaf blade just below the tip, which is a distinctive feature. The pitchers are usually dark purple in colour while the peristome ranges from red to purple. Nepenthes rajah grows in open, grassy vegetation in sites which are permanently moist. It always grows terrestrially in serpentine soils. There are no habitats of this type along the main summit trail of Mount Kinabalu, so it is not seen by most visitors. However, a small population persists near the newly opened Mesilau Resort, and interested visitors are sometimes taken to see these plants by the staff of Kinabalu Park. Some populations of N. rajah were seriously depleted by over collection in the 1970's. However, most populations are now off-limits to visitors and lie in remote parts of Kinabalu Park. Artificial propagation of plants in Western countries has helped reduce demand for plants collected from the wild, so the long term outlook for the survival of N. rajah in the wild is comparatively good."

- Nepenthes rajah

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